When you press the buttons, ANy one of the 3, if it doesn't light up (red), then your homelink is
1. not present (that makes me think the previous owner might have been involved in a traffic collision).
2. Homelink is fried.
The homelink unit is located inside the front bumper closer to the passenger side. If you get a chance pop open the bumper. Chances are whoever installed the homelink back into the vehicle did not plug in the wire connector harness.
You mentioned the buttons are lit. The buttons should light up when you turn on your parking/low-beam headlights. This is part of your ambient lighting/interior lighting system. It does not reflect the functionality of the homelink unit itself. But if the LED doesn't light up in response to the buttons then read 1 and 2 above.
GL
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